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And when you add the butter, be sure it is at room temperature, not melted. Add it as you would for brioche dough, dotting it in slowly and allowing each addition to be fully incorporated before adding the next. This allows the butter to be incorporated via the emulsifying lipids (fats) in the egg yolks. If you melt the butter, you liberate its water (18% of its weight/volume), which makes it available to the gluten in the flour, running the risk of overdeveloping, and therefore toughening it.